CN113885178A - Wide-spectrum image space telecentric athermal optical system - Google Patents
Wide-spectrum image space telecentric athermal optical system Download PDFInfo
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/22—Telecentric objectives or lens systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/028—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
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Abstract
The invention relates to a wide-spectrum image space telecentric athermalized optical system which consists of a first lens and a second lens with negative diopter, a third lens and a fourth lens with positive diopter, a diaphragm, a fifth lens and a sixth lens with positive diopter, a seventh lens with negative diopter, an eighth lens with positive diopter and a ninth lens which are sequentially arranged along the light incidence direction; the first lens is a meniscus lens, the object plane side is a convex surface, and the image plane side is a concave surface; the second lens is a biconcave lens; the third lens is a meniscus lens, the object plane side is a concave surface, and the image plane side is a convex surface; the fourth lens is a biconvex lens; the fifth lens is a biconvex lens; the sixth lens is a meniscus lens, the object plane side is a concave surface, and the image plane side is a convex surface; the seventh lens is a biconcave lens; the eighth lens is a biconvex lens. The ninth lens is a biconvex lens, or a meniscus lens with a convex object surface side and a concave image surface side. The invention can adapt to the environment temperature change of-50 to 60 ℃ and meet the requirement of large view field.
Description
Technical Field
The invention belongs to the technical field of optical imaging, and particularly relates to a wide-spectrum image space telecentric athermal optical system which can be used in an aerospace remote sensing imaging system.
Background
With the increasingly wide application of aerospace remote sensing in different fields, the optical imaging module in the remote sensing system is gradually developing towards the direction of large field of view and wide band. Considering that the relative illumination of an image plane is in direct proportion to the cosine of the fourth power of the field angle of an image, particularly for a large-field-of-view imaging system, when the field angle of light at the image is large, a serious illumination non-uniformity phenomenon is generated, and the telecentric structure at the image plane improves the illumination uniformity of the image plane in the field of remote sensing imaging. 400-1000nm is used as the most common wave band range in the remote sensing field, and no report of an image space telecentric optical system covering the full wave band range is seen.
The Chinese patent publication discloses a large-field image space telecentric optical system (publication No. CN102023369A), the applicable waveband of the system is only 900-1000nm, and the field angle is 30.4 degrees; an image space telecentric lens (CN106054360A) for space discloses an image space telecentric lens for space, the wave band range is only visible light wave band, the visual angle is only 16 degrees, and the wide spectrum large visual field telecentric lens of visible-near infrared wave band is not reported in the prior published documents.
In addition, the use environment in the field of remote sensing imaging is complex, the change of the ambient temperature is large, and the athermalization of the lens can meet the application under different temperature conditions. The design of a wide-spectrum image space telecentric athermalized optical system becomes the standard configuration requirement in the field of remote sensing imaging.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a wide-spectrum image space telecentric athermalization optical system, which is suitable for wide-spectrum imaging of 400-plus-1000 nm, has a field angle of more than 40 degrees, can adapt to temperature change of-50-60 ℃, and meets the requirement of high image quality in the field of remote sensing imaging.
In order to solve the technical problem, the wide-spectrum image space telecentric athermalization optical system comprises a first lens and a second lens with negative diopter, a third lens and a fourth lens with positive diopter, a diaphragm, a fifth lens and a sixth lens with positive diopter, a seventh lens with negative diopter, an eighth lens with positive diopter and a ninth lens which are sequentially arranged along the light incidence direction; the first lens is a meniscus lens, the object plane side is a convex surface, and the image plane side is a concave surface; the second lens is a biconcave lens; the third lens is a meniscus lens, the object plane side is a concave surface, and the image plane side is a convex surface; the fourth lens is a biconvex lens; the fifth lens is a biconvex lens; the sixth lens is a meniscus lens, the object plane side is a concave surface, and the image plane side is a convex surface; the seventh lens is a biconcave lens; the eighth lens is a biconvex lens.
The ninth lens is a biconvex lens.
The ninth lens is a meniscus lens, the object plane side of the ninth lens is a convex surface, and the image plane side of the ninth lens is a concave surface.
Further, each lens optical surface is spherical.
The first lens 1 to the ninth lens are made of H-ZF52TT, H-ZLAF66GT, H-ZK50, ZF7LGT, H-FK95N, H-QK3L, H-ZF3, H-ZK50GT and D-ZF93 in sequence.
The focal length of the first lens is between-270 mm and-75 mm, the focal length of the second lens is between-20 mm and-18 mm, the focal length of the third lens is between 80mm and 2268mm, the focal length of the fourth lens is between 32mm and 40mm, the focal length of the fifth lens is between 15mm and 19.5mm, the focal length of the sixth lens is between 1000mm and 4207mm, the focal length of the seventh lens is between-11 mm and-9 mm, the focal length of the eighth lens is between 17.5mm and 25mm, and the focal length of the ninth lens is between 29mm and 34 mm.
The air space between the first lens and the second lens is between 5.5 and 11.5mm, the air space between the second lens and the third lens is between 2.8-5.8mm, the air space between the third lens and the fourth lens is between 0.3 and 2.5mm, the air space between the fourth lens and the fifth lens is between 20.4 and 28.9mm, the air space between the fifth lens and the sixth lens is between 0.9 and 1.2mm, the air space between the sixth lens and the seventh lens is between 0.29 and 1.1mm, the air space between the seventh lens and the eighth lens is between 0.7 and 1.0mm, the air space between the eighth lens and the ninth lens is between 17-21.3mm, and the air interval between the ninth lens and the image surface is between 9.3 and 15 mm.
The thickness of the first lens is 5.0-8.0 mm, the thickness of the second lens is 1.8-4.7mm, the thickness of the third lens is 3.6-7.2 mm, the thickness of the fourth lens is 3.2-4.3 mm, the thickness of the fifth lens is 2.7-3.5 mm, the thickness of the sixth lens is 2.0-3.5 mm, the thickness of the seventh lens is 1.6-2.0 mm, the thickness of the eighth lens is 2.8-3.4 mm, and the thickness of the ninth lens is 5.0-8.0 mm.
The wide-spectrum optical lens covers the wavelength range of 400-1000nm, realizes the correction of chromatic aberration by reasonably optimizing and selecting surface type parameters, glass materials and the like, obtains a better imaging effect in a wide spectrum range, and is of a spherical structure which is easy to process, and the glass materials are common materials with the domestic Chengdu photopic plain.
The invention is an image space telecentric system, controls the light angle of each view field reaching the image surface, realizes the uniformity of the relative illumination of the image surface to be more than 95 percent, and ensures the brightness uniformity and consistency of the images of each view field angle of the detector.
The optical lens is a athermal lens, selects an appropriate thermal expansion coefficient optical material, and mutually compensates with a lens barrel material (aluminum) under the conditions of high temperature and low temperature, can adapt to the environment temperature change of-50-60 ℃, does not need human intervention, and can realize higher imaging quality at different temperatures.
The invention has the advantages of
The invention provides a 400-plus-1000 nm wide-spectrum image space telecentric athermalized optical system, which can realize relatively uniform image plane relative illumination, can adapt to the environment temperature change of-50-60 ℃, is suitable for the field of aerospace remote sensing imaging, has a lens length of less than 110mm and a weight of less than 35g, can meet the requirements of a large field of view, a field angle of more than 40 degrees, and simultaneously meets the requirements of small volume, wide spectrum, good image quality and the like.
Drawings
FIG. 1 is a schematic diagram of a wide-spectrum image-space telecentric athermalized optical system of the present invention;
FIG. 2 is a relative contrast distribution of the imaging lens of embodiment 1-1 at the image plane;
fig. 3(a), 3(b), and 3(c) are MTF transfer function curves of the imaging lens of example 1-1 at room temperature of 20 ℃, low temperature of-50 ℃, and high temperature of +60 ℃.
FIG. 4 is a relative contrast distribution pattern at an image plane of the imaging lens of the embodiment 2-1;
FIGS. 5(a) -5 (e) are MTF transfer function curves of the B-band (400-500nm), the G-band (520-600nm), the R-band (630-680nm), the near-infrared 1(780-895nm), and the near-infrared 2(900-1000nm) at 20 ℃ in the imaging lens of example 2-1, respectively.
FIGS. 6(a) -6 (e) are MTF transfer function curves of the B-band (400-500nm), G-band (520-600nm), R-band (630-680nm), near-infrared 1(780-895nm), and near-infrared 2(900-1000nm) at-50 ℃ in the imaging lens of example 2-1.
FIGS. 7(a) -7 (e) are MTF transfer function curves of the B-band (400-500nm), G-band (520-600nm), R-band (630-680nm), near-infrared 1(780-895nm), and near-infrared 2(900-1000nm) at a high temperature of +60 ℃ for the imaging lens of example 2-1.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples, it being understood that the specific embodiments described herein are illustrative of the invention only and are not limiting. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other suitable relationship. The specific meanings of the above terms in the present invention can be specifically understood in specific cases by those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," or "beneath" a second feature includes the first feature being directly under or obliquely below the second feature, or simply means that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
As shown in fig. 1, the wide-spectrum image-space telecentric athermalized optical system of the present invention is composed of 9 lenses, and includes a first lens 1 and a second lens 2 having negative refractive power, a third lens 3 and a fourth lens 4 having positive refractive power, a diaphragm 10, a fifth lens 5 and a sixth lens 6 having positive refractive power, a seventh lens 7 having negative refractive power, an eighth lens 8 and a ninth lens 9 having positive refractive power, which are sequentially arranged in the light incident direction. The first lens 1 is a meniscus lens, the object plane side is a convex surface, the image plane side is a concave surface, the second lens 2 is a biconcave lens, the third lens 3 is a meniscus lens, the object plane side is a concave surface, the image plane side is a convex surface, and the fourth lens 4 is a biconvex lens; the fifth lens element 5 is a biconvex lens, the sixth lens element 6 is a meniscus lens, the object plane side is a concave surface, the image plane side is a convex surface, the seventh lens element 7 is a biconcave lens, the eighth lens element 8 is a biconvex lens, and the ninth lens element 9 is a biconvex lens or a meniscus lens (a biconvex lens is used in embodiment 1, and a meniscus lens is used in embodiment 2).
The coverage wave band range of the optical system is 400-1000nm, the correction of chromatic aberration is realized through reasonable optimization selection of surface type parameters, glass materials and the like, a good imaging effect in a wide spectrum range is obtained, the lens structures are all spherical structures which are easy to process, and the glass materials are common materials with all-weather conditions in China.
The first lens to the eighth lens are made of H-ZF52TT, H-ZLAF66GT, H-ZK50, ZF7LGT, H-FK95N, H-QK3L, H-ZF3, H-ZK50GT and D-ZF93 in sequence.
The optical system is an image space telecentric system, the size of the light angle from each view field to the image plane is controlled, the uniformity of the relative illumination of the image plane can be more than 95%, and the brightness uniformity and consistency of the images of each view field angle of the detector are ensured.
The optical system is a athermal lens, selects an optical material with a proper thermal expansion coefficient, and compensates with a lens barrel material (aluminum) under high and low temperature conditions, so that the optical system can adapt to the environment temperature change of-50-60 ℃, does not need human intervention, and can realize higher imaging quality at different temperatures.
The optical system can be applied to the high-spectrum remote sensing imaging in 400-plus-1000 nm full wave band, can also be set in a plurality of wave bands and is applied to the multi-spectrum remote sensing imaging, and specific wave band information can be optimally designed according to multiple structures in the multi-spectrum application, so that the optimal imaging effect of different wave bands can be realized.
Example 1
The embodiment is suitable for 400-plus-1000 nm full-waveband imaging and performs achromatic design aiming at the full waveband.
The focal length of the first lens 1 is-98 to-75 mm, the focal length of the second lens 2 is-20 to-18 mm, the focal length of the third lens 3 is 80 to 110mm, and the focal length of the fourth lens 4 is 36 to 40 mm; the focal length of the fifth lens 5 is 15.00-16 mm, the focal length of the sixth lens 6 is 1000-3260 mm, the focal length of the seventh lens 7 is-10-9 mm, the focal length of the eighth lens 8 is 22-25 mm, and the focal length of the ninth lens 9 is 29.00-32.00 mm.
The thickness of the first lens 1 is 6.0-8.0 mm, and the interval between the rear surface of the first lens and the front surface of the second lens 2 is 6.7-7.3 mm; the thickness of the second lens 2 is 2-4.7mm, and the interval between the rear surface of the second lens and the front surface of the third lens 3 is 2.8-3.4 mm; the thickness of the third lens 3 is 6.000-7.3 mm, and the interval between the rear surface of the third lens and the front surface of the fourth lens 4 is 0.29-1.0 mm; the thickness of the fourth lens 4 is 3.6-4.3 mm, and the interval between the rear surface of the fourth lens 4 and the front surface of the fifth lens 5 is 20.4-28.9 mm; the thickness of the fifth lens 5 is 3.1-3.5 mm, and the interval between the rear surface of the fifth lens and the front surface of the sixth lens 6 is 0.9-1.2 mm; the thickness of the sixth lens 6 is 2.03-2.5 mm, and the distance between the rear surface of the sixth lens and the front surface of the seventh lens 7 is 0.3-0.5 mm; the thickness of the seventh lens 7 is 1.6-2.0 mm, and the interval between the rear surface of the seventh lens 7 and the front surface of the eighth lens 2 is 0.7-1.0 mm; the thickness of the eighth lens 8 is 2.8-3.1 mm, and the distance between the rear surface of the eighth lens 8 and the front surface of the ninth lens 9 is 17-18.9 mm; the thickness of the ninth lens 9 is 6.00-8.00 mm, and the distance between the ninth lens and the image plane 11 is 9.3-12.2 mm.
Examples 1-1 data of basic parameters of each lens are shown in Table 1-1.
TABLE 1-1
Fig. 2 shows the relative illuminance condition of the imaging lens of embodiment 1-1 on the image plane, which shows that the relative illuminance is greater than 95% in all the fields of view, and relatively uniform illumination can be achieved.
Fig. 3 is a modulation transfer function curve MTF of the imaging lens of embodiment 1-1 at half field angles of 0 °, 5 °, 11 °, 17 °, and 20 ° under different temperature conditions. Therefore, under different temperatures, the modulation transfer function values MTF of all the fields are larger than 0.3 under the condition of 110lp/mm, the curve is smooth and compact, the chromatic aberration correction is better, the full-wave-band full-field imaging quality is good, and the lens has better athermalization effect.
Based on the application of the full wave band, the invention also provides the following embodiments which have better imaging effect.
Examples 1-2 the basic parameter data for each lens are shown in tables 1-2.
Tables 1 to 2
Examples 1-3 the basic parameter data for each lens are shown in tables 1-3.
Tables 1 to 3
Example 2
In the embodiment, the multispectral remote sensing imaging system with multiple wave bands can be suitable for application of different specific requirements by adjusting the thickness and the interval of each lens. Taking five spectral channels as an example, the thickness and the interval of each lens are adjusted to satisfy the remote sensing imaging of the five spectral requirements of R (630-.
The focal length of the first lens 1 is-270 to-209, the focal length of the second lens 2 is-20 to-18, the focal length of the third lens 3 is 750 to 2268, and the focal length of the fourth lens 4 is 32 to 36; the focal length of the fifth lens 5 is 18.30-19.5, the focal length of the sixth lens 6 is 1790.0-4207, the focal length of the seventh lens 7 is-11-9.80, the focal length of the eighth lens 8 is 17.5-20.0, and the focal length of the ninth lens 9 is 32.0-34.
The thickness of the first lens 1 is 5-8 mm, and the interval between the rear surface of the first lens and the front surface of the second lens 2 is 5.5-11.5; the thickness of the second lens 2 is 1.8-2.5 mm, and the interval between the rear surface of the second lens and the front surface of the third lens 3 is 4.1-5.8 mm; the thickness of the third lens 3 is 4-7.2 mm, and the interval between the rear surface of the third lens and the front surface of the fourth lens 4 is 0.3-2.5 mm; the thickness of the fourth lens 4 is 3.2-3.7 mm, and the distance between the rear surface of the fourth lens and the front surface of the fifth lens 5 is 21.1-23.9 mm; the thickness of the fifth lens 5 is 2.7-3.1 mm, and the interval between the rear surface of the fifth lens and the front surface of the sixth lens 6 is 1.0-1.2 mm; the thickness of the sixth lens 6 is 2.1-2.4 mm, and the interval between the rear surface of the sixth lens and the front surface of the seventh lens 7 is 0.29-1.1 mm; the thickness of the seventh lens 7 is 1.8-2.0 mm, and the interval between the rear surface of the seventh lens and the front surface of the eighth lens 2 is 0.8-0.84 mm; the thickness of the eighth lens 8 is 3.1-3.4 mm, and the interval between the rear surface of the eighth lens 8 and the front surface of the ninth lens 9 is 18.8-21.3 mm; the thickness of the ninth lens 9 is 5-7 mm, and the distance between the ninth lens and the image plane 11 is 13.6-15 mm.
Example 2-1 the basic parametric data for each lens is shown in table 2-1 and is suitable for multi-spectral imaging of five band regions.
TABLE 2-1
| Lens serial number | Focal length of lens | Lens thickness t/spacing d | Material |
| 1 | -213.84 | 6/5.543 | H-ZF52TT |
| 2 | -18.46 | 1.8/4.459 | H-ZLAF66GT |
| 3 | 758.71 | 6/0.3 | H-ZK50 |
| 4 | 32.76 | 3.279/21.11 | |
| 5 | 18.36 | 2.737/1.142 | H- |
| 6 | 1888.5 | 2.365/0.298 | H-QK3L |
| 7 | -9.87 | 1.8/0.805 | H- |
| 8 | 17.56 | 3.215/18.873 | H-ZK50GT |
| 9 | 32.10 | 6/14.269 | D-ZF93 |
Fig. 4 shows the relative illuminance condition of the imaging lens of embodiment 2-1 on the image plane, which shows that the relative illuminance is greater than 95% in all the fields of view, and relatively uniform illumination can be achieved.
Fig. 5, 6, and 7 are modulation transfer function curves MTF at half field angles of 0 °, 5 °, 11 °, 17 °, and 20 ° under normal temperature, low temperature, and high temperature conditions, respectively, of the imaging lens of embodiment 2-1. It can be seen from the figure that the imaging lens has a slightly poor relative effect in the near infrared 1 and near infrared 2 bands, but still meets the imaging requirements, the modulation transfer function value MTF is greater than 0.2 at 110lp/mm, and the modulation transfer function values MTF of other fields of view in other bands are greater than 0.4 at 110 lp/mm. The MTFs exhibited a high degree of similarity under different temperature conditions, i.e., the temperature effect on the imaging system was substantially negligible.
Also, in the case of the divided band, the following 2 examples are given, with similar effects to example 2-1.
Example 2-2 the basic parametric data for each lens are shown in table 2-2 and are suitable for multi-spectral imaging of five band regions.
Tables 2 to 2
| Lens serial number | Focal length of lens | Lens thickness t/spacing d | Material |
| 1 | -266.1 | 5.11/11.47 | H-ZF52TT |
| 2 | -18.74 | 2/4.13 | H-ZLAF66GT |
| 3 | 854.6 | 7.13/0.3 | H-ZK50 |
| 4 | 35.3 | 3.39/22.7 | |
| 5 | 19.50 | 3.09/1.24 | H- |
| 6 | 4206.9 | 2.11/1.06 | H-QK3L |
| 7 | -10.78 | 2/0.84 | H- |
| 8 | 19.91 | 3.35/19.46 | H-ZK50GT |
| 9 | 34.03 | 7/13.65 | D-ZF93 |
Examples 2-3 the basic parametric data for each lens are shown in tables 2-3 and are suitable for multi-spectral imaging of five band regions.
Tables 2 to 3
| Lens serial number | Focal length of lens | Lens thickness t/spacing d | Material |
| 1 | -209.2 | 8.00/6.21 | H-ZF52TT |
| 2 | -19.55 | 2.5/5.75 | H-ZLAF66GT |
| 3 | 2268.2 | 4.00/2.42 | H-ZK50 |
| 4 | 35.42 | 3.66/23.91 | |
| 5 | 19.24 | 2.93/1.07 | H- |
| 6 | 1793.7 | 2.28/0.44 | H-QK3L |
| 7 | -10.83 | 2.00/0.83 | H- |
| 8 | 19.36 | 3.14/21.3 | H-ZK50GT |
| 9 | 32.59 | 5.00/14.57 | D-ZF93 |
The present invention is not limited to the above embodiments, and system parameters of other different bands may also be obtained according to specific use requirements. The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (8)
1. A wide-spectrum image space telecentric athermalized optical system is characterized by consisting of a first lens and a second lens with negative diopter, a third lens and a fourth lens with positive diopter, a diaphragm, a fifth lens and a sixth lens with positive diopter, a seventh lens with negative diopter, an eighth lens with positive diopter and a ninth lens which are sequentially arranged along the light incidence direction; the first lens is a meniscus lens, the object plane side is a convex surface, and the image plane side is a concave surface; the second lens is a biconcave lens; the third lens is a meniscus lens, the object plane side is a concave surface, and the image plane side is a convex surface; the fourth lens is a biconvex lens; the fifth lens is a biconvex lens; the sixth lens is a meniscus lens, the object plane side is a concave surface, and the image plane side is a convex surface; the seventh lens is a biconcave lens; the eighth lens is a biconvex lens.
2. The wide-spectrum image-space telecentric athermalized optical system of claim 1 wherein the ninth lens is a biconvex lens.
3. The wide-spectrum image-space telecentric athermalized optical system of claim 1 wherein the ninth lens is a meniscus lens with a convex object-side and a concave image-side.
4. The wide-spectrum image-space telecentric athermalized optical system of claim 1 wherein the optical surfaces of each lens are spherical.
5. The wide-spectrum image-space telecentric athermalized optical system of claim 1, wherein the first lens to the ninth lens are made of materials of H-ZF52TT, H-ZLAF66GT, H-ZK50, ZF7LGT, H-FK95N, H-QK3L, H-ZF3, H-ZK50GT and D-ZF93 in sequence.
6. The wide-spectrum image-space telecentric athermalized optical system of claim 5 wherein the focal length of the first lens is between-270 mm and-75 mm, the focal length of the second lens is between-20 mm and-18 mm, the focal length of the third lens is between 80mm and 2268mm, the focal length of the fourth lens is between 32mm and 40mm, the focal length of the fifth lens is between 15mm and 19.5mm, the focal length of the sixth lens is between 1000mm and 4207mm, the focal length of the seventh lens is between-11 mm and-9 mm, the focal length of the eighth lens is between 17.5mm and 25mm, and the focal length of the ninth lens is between 29mm and 34 mm.
7. The wide-spectrum image-space telecentric athermalized optical system of claim 6 wherein the air separation between the first and second lenses is between 5.5-11.5mm, the air separation between the second and third lenses is between 2.8-5.8mm, the air separation between the third and fourth lenses is between 0.3-2.5mm, the air separation between the fourth and fifth lenses is between 20.4-28.9mm, the air separation between the fifth and sixth lenses is between 0.9-1.2mm, the air separation between the sixth and seventh lenses is between 0.29-1.1mm, the air separation between the seventh and eighth lenses is between 0.7-1.0mm, the air separation between the eighth and ninth lenses is between 17-21.3mm, and the air interval between the ninth lens and the image surface is between 9.3 and 15 mm.
8. The wide-spectrum image-space telecentric athermalized optical system of claim 7 wherein the first lens has a thickness of 5.0 to 8.0mm, the second lens has a thickness of 1.8 to 4.7mm, the third lens has a thickness of 3.6 to 7.2mm, the fourth lens has a thickness of 3.2 to 4.3mm, the fifth lens has a thickness of 2.7 to 3.5mm, the sixth lens has a thickness of 2.0 to 3.5mm, the seventh lens has a thickness of 1.6 to 2.0mm, the eighth lens has a thickness of 2.8 to 3.4mm, and the ninth lens has a thickness of 5.0 to 8.0 mm.
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